State highways in India are stretches with heavy traffic intensity of more than 10,000 passenger car units (PCUs) but less than 30,000 PCUs which connect district headquarters, important towns and the National Highways in the state and neighboring states. The Construction & Maintenance wing of the Highways Department manages construction and maintenance of all the state highways (SH), major district roads (MDR), and other district roads (ODR). The Tamil Nadu State Highways Network has eight circles: Chennai, Villupuram, Madurai, Salem, Tiruchirappalli, Coimbatore, Tiruppur and Tirunelveli.
The state has a total of 286 state highways, 161 state highways urban (SH-U) stretches and 905 major district roads (MDRs), apart from other district roads (ODRs).
List of state highways This is a list of state highways in Tamil Nadu (as of March 2019).
SH1 to SH50 Road numberOSM relationName of roadDivisionLength (in km)Remarks SHN1 OSM Pollachi Eastern Bypass Road Pollachi 13.847 KM 0/0 to KM 3/3, KM 3/36 to KM 8/505 and KM 9/645 to KM 15/047 SHN2 OSM Tiruppur Ring Road Tiruppur 38.00 OSM Chennai - Ennore Expressway Road Tiruvallur 10.40 KM 8/0 to KM 18/4 OSM Manali Oil Refinary Road Tiruvallur 5.70 OSM Inner Ring Road Chennai City Roads 25.20 OSM Inner Ring Road (Southern Sector) Chennai City Roads 5.00 Chennai - Tiruvallur - Tiruttani - Renigunta Road 82.10 Upgraded as part of NH 716 OSM Arcot - Villupuram Road Vellore, Cheyyar, Villupuram 110.219 KM 0/0 to KM 77/8, KM 79/181 to KM 110/2 and KM 113/2 to KM 114/6, section between Semmambadi - Chetpet upgraded into NH179D OSM Sanipoondi - Kilpennathur - Avalurpet - Chetpet Road Tiruvannamalai, Villupuram 42.40 OSM Arcot - Tindivanam Road Vellore, Cheyyar, Villupuram 94.60 KM 0/0 to KM 81/9 and KM 82/0 to KM 94/4, 0.100 KMs missing between divisions OSM Kancheepuram - Thiruvathipuram Road Cheyyar 17.20 OSM Kallakurichi - Tiruvannamalai Road Kallakurichi, Tiruvannamalai 63.60 OSM Tiruvannamalai - Thanipadi - Harur Road Tiruvannamalai, Dharmapuri 75.40 SH6B OSM Thandrampet - Kottakulam Road Tiruvannamalai 18.20 SH7 OSM Villupuram - Mambalapattu - Thirukoilur Road Villupuram, Kallakurichi 35.10 KM 40/7 to KM 75/8 SH8 OSM Vikravandi - Kumbakonam - Thanjavur Road Thanjavur 11.395 KM 121/8 to KM 129/4 (Kumbakkonam), KM 133/8 to KM 136/37 (Sundaraperumal Kovil), KM 148/3 to KM 148/925 (Ayyampettai) and KM 158/6 to KM 159/2 (Thanjavur), rest of the section upgraded to old NH45C SH9 OSM Cuddalore - Chittoor Road Cuddalore, Kallakurichi, Thiruvannamalai, Vellore 126.10 KM 0/0 to KM 38/4, KM 38/2 to KM 84/8, KM 84/7 to KM 114/0, KM 138/8 to KM 143/6 and KM 196/0 to KM 203/0, runs till Andhra Pradesh border SH9A OSM Tiruvannamalai - Thiyagadurgam Road Tiruvannamalai, Kallakurichi 51.04 SH10 Cuddalore - Vridhachalam - Chinnasalem Road 111.152 Upgraded as NH532 SH11 OSM Calicut - Nilambur - Gudalur Road Udhagai 6.20 KM 103/6 to KM 109/8, runs from Kerala border SH12 OSM Calicut - Vythiri - Gudalur Road Udhagai 38.00 KM 96/4 to KM 134/4, runs from Kerala border SH13 Coimbatore - Dindigul Road 158.00 Upgraded as NH209 SH14 Coimbatore - Satyamangalam - Hasanur 106.00 Upgraded as NH209 SH15 OSM Udhagamandalam - Kotagiri - Mettupalayam - Sathy - Gobi - Erode Road Udhagai, Coimbatore, Gopichettipalayam, Erode 160.426 KM 0/0 to KM 57/6, KM 58/0 to KM 100/8 and KM 101/6 to KM 161/626 SH15A OSM Cheyur to Erode-Sathy Road Tiruppur, Gopichettipalayam 29.60 KM 0/0 to KM 25/2 and KM 25/8 to KM 30/2 SH16 Krishnagiri - Varadhampalli - Kuppam Road 19.00 Upgraded as NH219 SH17 OSM Malur - Hosur - Adhiyamankottai Road Krishnagiri, Dharmapuri 91.70 KM 0/0 to KM 4/5 and KM 16/0 to KM 103/2, runs from Karnataka border, Bagalur - Hosur - Adiyamankottai section upgraded as NH648 & NH844 SH17A OSM Hosur - Denkanikottai Road Krishnagiri 25.60 SH17B OSM Hosur - Thally - Denkanikottai Road Krishnagiri 42.20 SH17C OSM Bagalur - Berigai Road Krishnagiri 12.00 SH18 Salem - Harur - Tirupattur - Vaniyambadi Road 125.00 Upgraded as NH179A SH18A OSM Tirupattur – Singarapet Road Vaniyambadi, Krishnagiri 29.60 SH19 OSM Avinashi - Tiruppur - Palladam - Pollachi - Meenkarai - Kochi Road Tirupur, Pollachi 85.325 KM 13/8 to KM 76/875 and KM 77/35 to KM 99/6, KM 0/0 to KM 13/8 upgraded as NH381, runs till Kerala border SH19A OSM Tiruppur - Vijayamangalam Road Tiruppur, Erode 25.20 SH20 OSM Bhavani Road (Mayapuram - Central Busstand) via Agraharam urban stretch Erode 8.984 The entire stretch of KM 0/0 to KM 93/984 of Thoppur-Mettur-Bhavani-Erode has been declared as NH544H. While the improvement works are being carried over by NHAI from KM 0/0 to KM 85/0, the section from KM 85/0 to KM 93/984 urban stretch is still maintained by the SH department. SH20A OSM Mettur - Palar Road Edappadi 29.40 runs till Karnataka border SH21 OSM Pollachi - Dharapuram - Karur Road Pollachi, Dharapuram, Karur 114.27 KM 0/0 to KM 52/6, KM 56/4 to KM 118/07 SH22 OSM Grand Anaicut - Kaveripattinam Road Thanjavur, Mayiladuthurai 124.80 KM 0/0 to KM 33/0 and KM 33/4 to KM 125/2 SH23 OSM Mayiladuthurai - Thiruthuraipoondi Road Mayiladuthurai, Tiruvarur 68.40 SH24 Trichy - Chidambaram Road 135.40 Upgraded as NH227 SH25 OSM Trichy - Namakkal Road Trichy, Namakkal 77.40 KM 0/0 to KM 77/4 upgraded as NH381B SH26 OSM Trichy - Pudukkottai - Aranthangi - Mimisal Road Trichy, Pudukkottai 70.095 KM 0/0 to KM 1/6, KM 50/735 to KM 84/145 and KM 84/835 to KM 119/920, KM 1/6 to KM 50/735 upgraded as NH210 SH27 OSM Perambalur - Manamadurai Road Ariyalur, Thanjavur 16.19 KM 24/37 to KM 29/21 (Ariyalur), KM 64/85 to KM 71/2 (Thanjavur) and KM 72/2 to KM 77/2 (Thanjavur) SH28 Thirumayam - Karaikkudi - Devakottai - Devipattinam Road 97.70 Upgraded as NH210 SH29 OSM Thanjavur - Pattukkottai - Aranthangi - Karaikudi - Paramakudi - Sayalkudi Road Thanjavur, Pudukkottai, Sivagangai, Ramnad 241.024 KM 0/0 to KM 123/771, KM 130/771 to KM 164/356 and KM 164/556 to KM 248/224 SH30 OSM Musiri - Thuraiyur - Attur Road Trichy, Salem 91.20 SH31 Karur - Gudalur - Mysore Road 287.00 Upgraded as NH67 Extension SH32 OSM Madurai - Tuticorin Road Madurai, Tuticorin 19.60 KM 0/0 to KM 11/0 (Madurai), KM 90/8 to KM 92/6 (Ettayapuram) and KM 126/4 to KM 133/2 (Tuticorin), rest of the sections upgraded as NH45B SH33 OSM Madurai - Thondi Road Madurai 19.20 SH34 OSM Ramanathapuram - Nainarkoil - Andakudi - Elayankudi - Sivagangai - Melur Road Ramnad, Sivagangai, Madurai 98.096 KM 0/0 to KM 41/8, KM 43/8 to KM 74/072, KM 76/072 to KM 89/896 and KM 90/8 to KM 103/0 SH34A OSM Uppoor - Kottaiyur Road Ramnad, Sivagangai 36.80 SH35 OSM Dindigul - Natham - Singampunari - Thiruppathur - Karaikudi Road Madurai, Sivagangai 50.40 KM 45/6 to KM 51/6, KM 53/0 to KM 81/8, KM 82/2 to KM 97/2 and KM 101/8 to KM 102/4, KM 0/0 to KM 102/4 upgraded as NH383 SH36 Dindigul - Vathalagundu - Periyakulam - Theni - Cumbum - Kumuli Road 133.50 Upgraded as NH45 Extension SH37 OSM Mettur - Oddanchatram - Dharapuram - Tirupur Road Dindigul, Palani, Dharapuram, Tirupur 103.00 KM 0/0 to KM 32/0 and KM 37/4 to KM 108/4, KM 108/4 to KM 126/2 upgraded as NH381 SH38 OSM Aruppukottai - Perunali - Sayalkudi - Kadugusandai - Mariyur - Valinokkam Road Virudhunagar, Ramnad 73.46 KM 0/0 to KM 52/4 and KM 58/2 to KM 79/26, KM 52/4 to KM 58/2 upgraded as NH32 SH39 OSM Tirunelveli - Shencottai - Kollam Road Tirunelveli, Tenkasi 56.135 KM 0/0 to KM 2/0 and KM 2/865 to KM 57/0 SH39A OSM Shencottai - Surandai - Pavoorchatram Road Tenkasi 31.20 SH39B OSM Athiyuthu - Surandai - Sendamaram Road Tenkasi 22.87 SH40 OSM Tiruchendur - Palayamkottai - Ambasamudram - Tenkasi - Courtalam - Shencottai Road Tuticorin, Tirunelveli, Tenkasi 134.20 SH40A OSM Kadayam - Mukkudal Road Tirunelveli 28.00 SH40B OSM Ambasamudram - Alangulam Road Tirunelveli 20.40 SH41 OSM Rajapalayam - Sankarankovil - Tirunelveli Road Virudhunagar, Tenkasi, Tirunelveli 85.73 SH41A OSM Tirunelveli - Pottalpudur Road Tirunelveli 36.60 begins at the end of an ODR SH42 OSM Srivilliputhur - Sivakasi - Virudhunagar - Aruppukottai - Narikudi - Parthibanur Road Virudhunagar, Ramanad 109.26 SH43 OSM Tenkasi - Panpozhi - Thirumalaikovil Road Tenkasi 14.00 SH44 OSM Paruvakudi - Kovilpatti - Ettayapuram - Vilathikulam - Vembar Road Tenkasi, Tuticorin 91.80 SH45 OSM Aralvaimozhi - Nedumangadu Road Nagercoil 48.90 runs till Kerala border SH46 OSM Aralvaimozhi - Nagercoil - Rajakkamangalam - Colachel Road Nagercoil 9.40 KM 18/8 to KM 28/2, runs between Nagercoil and Rajakkamangalam. SH47 OSM Parthibanur - Kamuthi - Aruppukottai Road Ramnad 41.65 SH48 OSM Marmalong Bridge - Irumbuliyur - Vandalur - Mudichur - Oragadam - Walajabad Road Chennai City Roads, Chengalpattu 49.60 KM 5/0 to KM 21/2 and KM 30/4 to KM 63/8 SH48A OSM Mount - Medavakkam Road Chennai City Roads 9.10 SH48B OSM Taramani Link Road Chennai City Roads 3.63 SH48C OSM Velachery Bypass Road Chennai City Roads 1.90 SH49 OSM East Coast Road (Thiruvanmiyur - Mahabalipuram - Marakkanam - Pondicherry Road) Chennai City Roads, Chengalpattu, Villupuram 134.20 KM 11/8 to KM 112/0 and KM 100/8 to KM 134/8. KM 57/0 to KM 68/8 to KM 11/0 and KM 100/8 to KM 134/8 upgraded as NH332A SH49A OSM Rajiv Gandhi Road (Chennai - Thiruporur - Mahabalipuram Road) Chennai City Roads, Chengalpattu 43.70 KM 13/3 to KM 55/6 and KM 57/0 to KM 58/4 SH49B OSM Medavakkam - Sholinganallur - Kudimiyandi Thoppu Road Chennai City Roads 6.70 SH49B OSM Thirukalukundram - Mamallapuram Road Chengalpattu 13.20 SH50 OSM Thirumazhisai - Thiruvallur - Uthukottai Road Tiruvallur 46.00 SH50A OSM Korattur – Thinnanur – Periyapalayam Road Tiruvallur 28.73 SH50B OSM Thandalam - Perambakkam - Thakkolam - Arugilpadi Road Chengalpattu, Tiruvallur, Vellore 39.40
SH51 to SH100